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  GBase8s测试BLOB和CLOB
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  <time datetime="2023-05-09T13:44:33.000Z" itemprop="datePublished">2023-05-09</time>
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  <h3 id="建表"><a href="#建表" class="headerlink" title="建表"></a>建表</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">CREATE TABLE t_smart_objects ( id_num int, picture blob, felony clob )PUT picture in(sbspace01);</span><br></pre></td></tr></table></figure>

<h3 id="插入一行数据"><a href="#插入一行数据" class="headerlink" title="插入一行数据"></a>插入一行数据</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">INSERT INTO t_smart_objects VALUES(1,FILETOBLOB(&#x27;/tmp/aaa.jpg&#x27;,&#x27;client&#x27;),filetoclob(&#x27;/tmp/aaa1.txt&#x27;,&#x27;client&#x27;));</span><br><span class="line">INSERT INTO t_smart_objects VALUES(2,FILETOBLOB(&#x27;/tmp/aaa.jpg&#x27;,&#x27;client&#x27;),filetoclob(&#x27;/tmp/aaa2.txt&#x27;,&#x27;client&#x27;));</span><br><span class="line">INSERT INTO t_smart_objects VALUES(3,FILETOBLOB(&#x27;/tmp/aaa.jpg&#x27;,&#x27;client&#x27;),filetoclob(&#x27;/tmp/aaa3.txt&#x27;,&#x27;client&#x27;));</span><br></pre></td></tr></table></figure>

<h3 id="用python程序读取这个图片内容，和这个文件内容"><a href="#用python程序读取这个图片内容，和这个文件内容" class="headerlink" title="用python程序读取这个图片内容，和这个文件内容"></a>用python程序读取这个图片内容，和这个文件内容</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">import jaydebeapi</span><br><span class="line"></span><br><span class="line">class gbasedb():</span><br><span class="line">    def __init__(self,ip,port,dbname,sername,user,pwd):</span><br><span class="line">        self.conn = jaydebeapi.connect(&quot;com.gbasedbt.jdbc.Driver&quot;,</span><br><span class="line">                                            f&quot;jdbc:gbasedbt-sqli://&#123;ip&#125;:&#123;port&#125;/&#123;dbname&#125;:GBASEDBTSERVER=&#123;sername&#125;;DB_LOCALE=zh_CN.utf8;CLIENT_LOCALE=zh_CN.utf8;IFX_LOCK_MODE_WAIT=60&quot;,</span><br><span class="line">                                            [user, pwd],</span><br><span class="line">                                            &quot;gbasedbtjdbc_3.3.0_2_36477d.jar&quot;</span><br><span class="line">                                            )</span><br><span class="line">        self.mycursor = self.conn.cursor()</span><br><span class="line">    </span><br><span class="line">    def select(self,sql):</span><br><span class="line">        self.mycursor.execute(sql)</span><br><span class="line">        rows = self.mycursor.fetchall()</span><br><span class="line">        return rows</span><br><span class="line"></span><br><span class="line">    def exec(self,sql):</span><br><span class="line">        self.mycursor.execute(sql)</span><br><span class="line"></span><br><span class="line">    def close(self):</span><br><span class="line">        self.mycursor.close()</span><br><span class="line">        self.conn.close()</span><br><span class="line">    </span><br><span class="line"># 创建连接</span><br><span class="line">db=gbasedb(&quot;1.1.1.7&quot;,&quot;9083&quot;,&quot;testdb&quot;,&quot;g330&quot;,&quot;gbasedbt&quot;,&quot;GBase123&quot;)</span><br><span class="line"></span><br><span class="line"># 执行查询</span><br><span class="line">rows = db.select(&quot;select id_num,picture,felony from t_smart_objects ;&quot;)</span><br><span class="line">for k,(id,b,c) in enumerate(rows):</span><br><span class="line">    print(id,b,c)</span><br><span class="line"></span><br><span class="line"># 断开连接</span><br><span class="line">db.close()</span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h3 id="可以看到python能读取到，但是不能直接打印"><a href="#可以看到python能读取到，但是不能直接打印" class="headerlink" title="可以看到python能读取到，但是不能直接打印"></a>可以看到python能读取到，但是不能直接打印</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">PS D:\soft\src\Python3\Django\project01\app01\database\智能大对象操作测试&gt; python.exe .\read_blob_clob.py</span><br><span class="line">1 com.gbasedbt.jdbc.IfxBblob@5f205aa com.gbasedbt.jdbc.IfxCblob@6d86b085</span><br><span class="line">PS D:\soft\src\Python3\Django\project01\app01\database\智能大对象操作测试&gt;</span><br></pre></td></tr></table></figure>

<h3 id="吧这两个对象存入文件？"><a href="#吧这两个对象存入文件？" class="headerlink" title="吧这两个对象存入文件？"></a>吧这两个对象存入文件？</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">#正常，不报错</span><br><span class="line">fo = open(&quot;aaa.txt&quot;,&quot;w&quot;)</span><br><span class="line">fo.write(str(id))</span><br><span class="line">fo.close()</span><br></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">#报错，TypeError: write() argument must be str, not com.gbasedbt.jdbc.IfxCBblob</span><br><span class="line">fo = open(&quot;aaa.txt&quot;,&quot;w&quot;)</span><br><span class="line">fo.write(b)</span><br><span class="line">fo.close()</span><br></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">#报错，TypeError: write() argument must be str, not com.gbasedbt.jdbc.IfxCblob</span><br><span class="line">fo = open(&quot;aaa.txt&quot;,&quot;w&quot;)</span><br><span class="line">fo.write(c)</span><br><span class="line">fo.close()</span><br></pre></td></tr></table></figure>

<h3 id="这样存储BLOB和CLOB到文件"><a href="#这样存储BLOB和CLOB到文件" class="headerlink" title="这样存储BLOB和CLOB到文件"></a>这样存储BLOB和CLOB到文件</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line">import jaydebeapi</span><br><span class="line"></span><br><span class="line">class gbasedb():</span><br><span class="line">    def __init__(self,ip,port,dbname,sername,user,pwd):</span><br><span class="line">        self.conn = jaydebeapi.connect(&quot;com.gbasedbt.jdbc.Driver&quot;,</span><br><span class="line">                                            f&quot;jdbc:gbasedbt-sqli://&#123;ip&#125;:&#123;port&#125;/&#123;dbname&#125;:GBASEDBTSERVER=&#123;sername&#125;;DB_LOCALE=zh_CN.utf8;CLIENT_LOCALE=zh_CN.utf8;IFX_LOCK_MODE_WAIT=60&quot;,</span><br><span class="line">                                            [user, pwd],</span><br><span class="line">                                            &quot;gbasedbtjdbc_3.3.0_2_36477d.jar&quot;</span><br><span class="line">                                            )</span><br><span class="line">        self.mycursor = self.conn.cursor()</span><br><span class="line">    </span><br><span class="line">    def select(self,sql):</span><br><span class="line">        self.mycursor.execute(sql)</span><br><span class="line">        rows = self.mycursor.fetchall()</span><br><span class="line">        return rows</span><br><span class="line"></span><br><span class="line">    def exec(self,sql):</span><br><span class="line">        self.mycursor.execute(sql)</span><br><span class="line"></span><br><span class="line">    def close(self):</span><br><span class="line">        self.mycursor.close()</span><br><span class="line">        self.conn.close()</span><br><span class="line">    </span><br><span class="line"># 创建连接</span><br><span class="line">db=gbasedb(&quot;1.1.1.7&quot;,&quot;9083&quot;,&quot;testdb&quot;,&quot;g330&quot;,&quot;gbasedbt&quot;,&quot;GBase123&quot;)</span><br><span class="line"></span><br><span class="line"># 执行查询</span><br><span class="line">rows = db.select(&quot;select id_num,lotofile(picture,&#x27;blob&#x27;,&#x27;client&#x27;),lotofile(felony ,&#x27;clob&#x27;,&#x27;client&#x27;) from t_smart_objects ;&quot;)</span><br><span class="line">fo = open(&quot;aaa.txt&quot;,&quot;w&quot;)</span><br><span class="line">fo.close()</span><br><span class="line">for k,(id,b,c) in enumerate(rows):</span><br><span class="line">    print(id,b,c)</span><br><span class="line">    fo = open(&quot;aaa.txt&quot;,&quot;a&quot;)</span><br><span class="line">    fo.write(str(id)+&quot;|&quot;+b+&quot;|&quot;+c+&quot;\n&quot;)</span><br><span class="line">    fo.close()</span><br><span class="line"># 断开连接</span><br><span class="line">db.close()</span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>上面程序的运行结果如下，BLOB和CLOB都存存储到了文件</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">PS D:\soft\src\Python3\Django\project01\app01\database\智能大对象操作测试&gt; python.exe .\read_blob_clob.py</span><br><span class="line">1 blob.1589924831 clob.1644716430</span><br><span class="line">1 blob.749102841 clob.1323486100</span><br><span class="line">2 blob.1527510893 clob.1148413881</span><br><span class="line">3 blob.1450167526 clob.1972740189</span><br><span class="line">PS D:\soft\src\Python3\Django\project01\app01\database\智能大对象操作测试&gt; cat aaa.txt</span><br><span class="line">1|blob.1589924831|clob.1644716430</span><br><span class="line">1|blob.749102841|clob.1323486100</span><br><span class="line">2|blob.1527510893|clob.1148413881</span><br><span class="line">3|blob.1450167526|clob.1972740189</span><br></pre></td></tr></table></figure>

<h3 id="数据库使用BLOB和CLOB小结"><a href="#数据库使用BLOB和CLOB小结" class="headerlink" title="数据库使用BLOB和CLOB小结"></a>数据库使用BLOB和CLOB小结</h3><ul>
<li>使用LOTOFILE下载BLOB和CLOB到本地</li>
<li>使用FILETOBLOB上传图片到数据库</li>
<li>使用FILETOCLOB上传文本到数据库</li>
<li>LOCOP() 复制BLOB或者CLOB数据到另外一个BLOB或者CLOB列中</li>
</ul>
<h3 id="Python中读取图片BLOB到字节串，读取文档CLOB到字节串"><a href="#Python中读取图片BLOB到字节串，读取文档CLOB到字节串" class="headerlink" title="Python中读取图片BLOB到字节串，读取文档CLOB到字节串"></a>Python中读取图片BLOB到字节串，读取文档CLOB到字节串</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">open_icon = open(&quot;blob.1589924831&quot;,&quot;rb&quot;) </span><br><span class="line">s = open_icon.read()</span><br><span class="line">open_icon.close() </span><br><span class="line"></span><br><span class="line">print(&quot;图片已经读入字符串s，s的类型是：&quot;,type(s))</span><br><span class="line"></span><br><span class="line">picture = open(&quot;blob.jpg&quot;,&quot;wb&quot;) </span><br><span class="line">picture.write(s) </span><br><span class="line">picture.close()</span><br><span class="line"></span><br></pre></td></tr></table></figure> 
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